Over the years, the Commission has greatly grown in size and operational capacity. From only 37,000 registered teachers in 1967 the number in the Register of Teachers has grown to more than 758,914 in 2017. Of these, around 300,000 are employed by the Teachers Service Commission while others are engaged in private schools, non-governmental organizations and different government agencies.

The Commission has a secretariat that manages the affairs of teachers. Operations of the secretariat have been enhanced through creation of specialized departments and divisions. From its inception in 1967 the secretariat has grown from 100 to over 3000 officers in 2017.